Flood Hazard Mapping of Bogowonto River in Purworejo Regency, Central Java

https://doi.org/10.22146/jcef.24348

Margaretha Titi Pawestri(1*), Joko Sujono(2), Istiarto Istiarto(3)

(1) Universitas Gadjah Mada
(2) Department of Civil and Environmental Engineering
(3) Department of Civil and Environmental Engineering
(*) Corresponding Author

Abstract


The overflowing discharge of Bogowonto River in Purworejo Regency, Central Java flooded the surrounding area during the rainy season. A huge amount of losses such as damage of infrastructures, housing, and agricultural area occurs every year. This research mainly aims to develop flood hazard map and study the characteristics of flood in the study area. There are two main analysis; hydrologic and hydraulic, to model a flood event. Hydrologic and hydraulic modelling of flood based on 20 and 50- years return period hydrograph along the river geometryis done using the latest HEC program namely HEC- HMS 4.1 and HECRAS 5.0. Also, ArcGIS 10.3 is used as a terrain pre-processor and post-processor for hazard mapping. The results of this research are flood hazard maps for 20 and 50 years flood and its comparison to the recent major flood events. Flood inundation modelled covered an area of 993.77 Ha and 1,175.86 Ha, with maximum discharge calculated at Boro Weir as starting point are 1206.2 m3/s and 1,397.3 m3/s for 20 and 50 years flood case, respectively.

Keywords


Flood, hazard mapping, floodplain mapping.

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References

Adhawiyah, H. A., 2014. Pemetaan Risiko Bencana Banjir Sungai Bogowonto Hilir [Flood Hazard Mapping in the Downstream of Bogowonto River], Yogyakarta.

BCEOM, 2005. Project Completion Report, Indonesia.

Chow, V. T., 1988. Open Channel Hydraulics. New York: Mc Graw-Hill Book Company.

Pawestri, M. T., 2016. Flood Hazard Mapping Of Bogowonto River In Purworejo Regency, Central Java, Yogyakarta: Master Thesis, Graduate Engineering of Natural Disaster Management, Universitas Gadjah Mada.

PT. Daya Cipta Dianrancana, 2015. Studi Morfologi Sungai Bogowonto dan Anak Sungainya [Study of Bogowonto River Morphology and the Tributaries], Yogyakarta: PT. Daya Cipta Dianrancana.



DOI: https://doi.org/10.22146/jcef.24348

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